Yes, it can exist.
This file type does not exists. It is xlsx (Microsoft Excel) file with wrong file extension.
What is the file extension What is the file extension
There is no answer for this, because it is the wrong question. A files extension doesn't matter to the file, it only exists so that the Operating System (OS) knows what application to open the file with. Technically you can have a text file with no extension if you don't mind telling Windows what program to use to open the file every time. Generally speaking .txt is the most common choice though.
file extension for video is 101
xlsm
.html, .php, or .htm
The file extension tells about the type of file, with the extension three letters. For Eg:- *.txt -- text file *.exe-- executable file
file extension
.cer for file without private key, .pfx for file with private key
the extension of a batch file is ".bat"
The file extension is ".pages"
The file extension of iPhone firmware file is .ipsw .